This might be one of many bugs related to the new "draft" feature
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NullUserException อ_อOct 6 '10 at 21:38

On something like the 5th try, I was able to submit the question. Is it possible that the criteria is comments, answers, and questions combined?
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ulty4lifeOct 6 '10 at 21:41

Did you get this error on your first attempt to submit, or did you try to submit but got a different error, then corrected and retried and got this error?
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Jon SeigelOct 6 '10 at 21:48

The error was on my first and subsequent attempts to submit until the final submit, when it successfully posted.
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ulty4lifeOct 6 '10 at 21:52

I'm getting the same issue. Haven't used my account in over a year, just created a question and keep getting this message. Nobody else in my company would use Stackoverlow so can't be an issue with IP address as suggested below. Is this a known bug?
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DamodogJan 16 '14 at 17:06

Thanks for the explanation. It was pretty confusing behavior for me.
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ulty4lifeOct 7 '10 at 17:11

1

Curious: does this only take questions from users < 125 into account? (So, in the answer above, was "another user" actually "another < 125 user"?)
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ArjanJan 19 '12 at 6:54

3

We are over 35 thousand users sitting behind a big natting firewall. My co-worker tried to post a new question and got that throttling error message. He was logged in with his own account. Is there no way to throttle on the accounts instead of IP addresses?
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delixfeFeb 4 '13 at 16:18

@delixfe it's a bit too easy to create new accounts for the throttle to really work. Only for relatively higer-rep users this could possibly work.
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MołotFeb 28 '14 at 15:10